Problem A
Happy Telephones — Problem Statistics

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Submissions	3331
Accepted submissions	1352
Submission ratio	40.59%
Authors	1004
Full solves [?]	867
Full solve Ratio	86.35%

#	User	Runtime	Language	Date
1	Saito Ta	0.62 s	Bash	2024-04-18 10:52:14
2	Chenzhang Hu	0.96 s	Bash	2024-04-18 14:12:15

#	User	Runtime	Language	Date
1	Eyleifur Bjarkason	0.02 s	C	2020-10-27 19:26:50
2	Michael Goodale	0.03 s	C	2019-03-04 19:11:29
3	Ivan Petrov	0.03 s	C	2019-05-23 08:43:18
4	Sabit Zahin	0.04 s	C	2015-10-20 19:45:32
5	Anton Haglund	0.04 s	C	2016-10-30 00:52:30
6	Dan Anderson	0.04 s	C	2017-03-07 01:25:20
7	Andrew Roberts	0.04 s	C	2017-08-25 09:12:53
8	Raymond Yang	0.04 s	C	2018-06-25 10:40:43
9	Grayce Zhu	0.04 s	C	2018-10-28 22:10:35
10	Andree Kaba	0.04 s	C	2018-11-08 01:47:42

#	User	Runtime	Language	Date
1	traxex	0.12 s	C#	2024-05-15 11:53:51
2	Anton Prasolov	0.14 s	C#	2021-03-16 11:41:12
3	Matias Suarez	0.14 s	C#	2025-06-20 22:46:22
4	Andriy Zyevakov	0.18 s	C#	2015-11-03 11:11:42
5	Jon Vegard Jansen	0.18 s	C#	2021-03-16 09:24:33
6	Henrik Hallbert	0.19 s	C#	2022-03-16 20:59:21
7	PumpedByFranck Tm	0.19 s	C#	2025-06-20 19:54:20
8	Andrzej Krajniak	0.20 s	C#	2019-06-26 19:57:07
9	Gustav Bech Henriksen	0.21 s	C#	2022-06-26 22:47:12
10	Brandon	0.21 s	C#	2025-06-21 00:33:13

#	User	Runtime	Language	Date
1	Donald Dong	0.02 s	C++	2018-01-02 03:31:20
2	Duarte Nóbrega	0.02 s	C++	2019-03-24 01:40:39
3	Erik Odenman	0.03 s	C++	2013-10-22 19:02:16
4	Hidden user	0.03 s	C++	2015-09-11 07:26:52
5	Neal Zane	0.03 s	C++	2015-12-21 02:05:26
6	Ossama Ahmed	0.03 s	C++	2016-11-23 05:35:17
7	Anthony Ho	0.03 s	C++	2017-03-07 07:55:06
8	Anthony Ho	0.03 s	C++	2017-03-07 16:26:20
9	Rehim Memmedli	0.03 s	C++	2017-08-19 07:40:42
10	Jiang Yue	0.03 s	C++	2018-02-02 05:49:28

#	User	Runtime	Language	Date
1	Hidden user	0.07 s	Common Lisp	2019-07-24 00:10:23
2	Jinwoo Lee	0.42 s	Common Lisp	2020-10-09 07:40:31
3	David Cawthon	0.42 s	Common Lisp	2021-01-17 04:35:28

#	User	Runtime	Language	Date
1	Christian Vestergaard	0.07 s	Go	2021-01-04 12:43:02
2	Norbert Voelker	0.08 s	Go	2021-09-25 23:21:48

#	User	Runtime	Language	Date
1	Hidden user	0.13 s	Haskell	2022-05-06 11:44:17
2	Steinar Simonnes	0.13 s	Haskell	2024-11-04 18:45:40
3	hhgrapes	0.53 s	Haskell	2024-05-11 13:01:25
4	Miguel Roldán Muñoz	0.53 s	Haskell	2024-06-04 19:51:57
5	Lockne	0.59 s	Haskell	2020-09-07 07:03:31
6	Marco Polo	0.68 s	Haskell	2022-12-02 20:26:54
7	Matthew Johnson	0.79 s	Haskell	2024-05-03 17:29:44

#	User	Runtime	Language	Date
1	Jakob Kallestad	0.16 s	Java	2019-05-02 00:25:30
2	Bjørn Dons	0.17 s	Java	2020-07-11 20:55:50
3	José Vander Meulen	0.17 s	Java	2024-06-19 19:58:16
4	Santiago Rivas	0.17 s	Java	2025-07-24 20:03:37
5	Rose Liu	0.20 s	Java	2021-09-24 19:51:52
6	Anais Ponsonnet	0.20 s	Java	2022-04-21 05:35:03
7	Issa Issack	0.22 s	Java	2025-04-05 06:18:13
8	Matthew Grenander	0.35 s	Java	2017-03-03 07:49:33
9	Ryan Bass	0.35 s	Java	2018-10-29 03:48:49
10	Andree Kaba	0.35 s	Java	2018-11-08 00:38:46

#	User	Runtime	Language	Date
1	Carl Sundvall	0.17 s	JavaScript (Node.js)	2018-10-28 12:30:17

#	User	Runtime	Language	Date
1	Bjørn Chr. Soltvedt	0.13 s	JavaScript (SpiderMonkey)	2016-08-09 14:40:29
2	Christian Pilegaard Cederquist	0.19 s	JavaScript (SpiderMonkey)	2023-05-26 22:40:07

#	User	Runtime	Language	Date
1	Hidden user	0.50 s	Kotlin	2020-04-08 23:58:48
2	Andrei Salauyeu	0.56 s	Kotlin	2024-02-22 20:13:06
3	Benjamin Laurence Erickson	0.62 s	Kotlin	2023-04-07 18:01:54
4	Troy Warmboe	0.77 s	Kotlin	2023-04-14 23:17:47
5	Adam Rankin	0.78 s	Kotlin	2023-09-15 22:24:47

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.06 s	Pascal	2025-07-03 21:43:18

#	User	Runtime	Language	Date
1	Saito Ta	0.61 s	Perl	2024-04-18 10:50:29

#	User	Runtime	Language	Date
1	Susanne Ragnemalm	0.60 s	PHP	2024-04-07 11:07:17

#	User	Runtime	Language	Date
1	Maj Stenmark	0.12 s	Python 2	2019-10-17 18:49:45
2	Elisabeth Sulmont	0.13 s	Python 2	2017-02-27 22:50:09
3	Njeri Muguthi	0.13 s	Python 2	2017-03-06 00:46:08
4	Ciara Godwin	0.13 s	Python 2	2018-04-07 11:36:12
5	Josenildo Silva	0.13 s	Python 2	2018-07-27 13:44:08
6	Mathieu Rundstrom	0.14 s	Python 2	2019-03-13 02:24:25
7	Christian Rachmaninoff	0.15 s	Python 2	2016-11-07 02:27:55
8	Hidden user	0.15 s	Python 2	2017-03-15 06:48:53
9	Gabe Cemaj	0.15 s	Python 2	2017-04-12 03:06:19
10	Jesper Öqvist	0.15 s	Python 2	2018-11-04 14:00:46

#	User	Runtime	Language	Date
1	Dominic Berzin Chua Way Gin	0.10 s	Python 3	2025-04-18 10:42:12
2	Ole Vik Lysne	0.12 s	Python 3	2025-01-20 12:02:06
3	Noah Hessen Bjerke	0.12 s	Python 3	2025-11-15 07:53:30
4	Russell	0.13 s	Python 3	2025-09-21 07:17:46
5	Hidden user	0.14 s	Python 3	2025-07-27 03:05:04
6	Ryan Tan	0.15 s	Python 3	2022-04-05 04:30:53
7	Lionel KITIHOUN	0.15 s	Python 3	2022-12-12 20:59:41
8	Henna K	0.15 s	Python 3	2024-02-12 23:16:56
9	Gacel Perfinian	0.15 s	Python 3	2024-05-09 18:15:52
10	Gabriel Caballero	0.15 s	Python 3	2024-10-19 00:19:35

#	User	Runtime	Language	Date
1	Thomas Feld	0.65 s	Ruby	2023-08-21 10:19:52

#	User	Runtime	Language	Date
1	Vincent Lagerros	0.00 s	Rust	2025-05-18 02:18:13
2	Carl Svensson	0.02 s	Rust	2022-11-08 01:37:01
3	Pahlevi Fikri Auliya	0.03 s	Rust	2020-11-17 02:24:03
4	Bas Dirks	0.03 s	Rust	2022-05-09 14:32:56
5	None of your buisness	0.03 s	Rust	2023-10-26 05:57:44
6	Diego Alejandro Rodrigues Rodriguez	0.03 s	Rust	2024-02-14 19:12:03
7	Tim Zig	0.04 s	Rust	2024-02-15 20:01:20
8	Gabriella Gloria	0.04 s	Rust	2025-05-02 13:27:32
9	Ming Kang	0.04 s	Rust	2025-06-04 09:08:56
10	Rudi Svartveit	0.05 s	Rust	2019-04-08 20:51:58

#	User	Length	Language	Date
1	Saito Ta	591	Bash	2024-04-18 10:52:14
2	Chenzhang Hu	610	Bash	2024-04-18 14:12:15

#	User	Length	Language	Date
1	Oliver Ruste Jahren	361	C	2023-05-22 20:42:03
2	Hu Yijie	449	C	2022-02-16 13:04:24
3	Raymond Yang	508	C	2018-06-25 10:40:43
4	Michael Goodale	610	C	2019-03-04 19:11:29
5	Sambit Palit	668	C	2020-11-02 02:10:24
6	Andrew Roberts	688	C	2017-08-25 09:12:53
7	Ivan Petrov	707	C	2019-05-23 08:43:18
8	Houkai Qian	708	C	2020-10-24 20:08:53
9	Dan Anderson	859	C	2017-03-07 01:31:16
10	Sabit Zahin	885	C	2015-10-20 19:45:32

#	User	Length	Language	Date
1	traxex	733	C#	2024-05-15 11:53:51
2	Fredrik Åhs	1449	C#	2020-10-26 15:48:28
3	Gustav Bech Henriksen	1633	C#	2022-06-26 22:47:12
4	PumpedByFranck Tm	1714	C#	2025-06-20 19:54:20
5	Henrik Hallbert	1834	C#	2022-01-03 11:18:23
6	Matias Suarez	1970	C#	2025-06-20 22:46:22
7	Brandon	1982	C#	2025-06-21 00:33:13
8	Jon Vegard Jansen	2089	C#	2021-03-16 09:33:34
9	Anton Prasolov	2318	C#	2021-03-11 08:45:34
10	Asbjørn Engås	2421	C#	2021-03-13 19:02:35

#	User	Length	Language	Date
1	Oliver Ruste Jahren	335	C++	2023-05-22 20:26:05
2	William Gan	406	C++	2017-12-19 09:46:05
3	Anshil Gandhi	420	C++	2019-04-14 00:52:46
4	Johan Wind	435	C++	2018-11-16 17:48:07
5	Elea Kim	463	C++	2019-03-13 03:22:05
6	Gloria Zhang	463	C++	2019-03-13 04:30:25
7	Way Tan	466	C++	2018-12-08 07:31:29
8	Ingrid Feng	472	C++	2019-03-02 09:57:59
9	Hyunjun Lee	477	C++	2022-11-23 11:44:45
10	ssh	481	C++	2020-11-27 23:23:05

#	User	Length	Language	Date
1	Hidden user	722	Common Lisp	2019-07-23 23:51:33
2	Jinwoo Lee	1142	Common Lisp	2020-10-09 07:40:31
3	David Cawthon	1182	Common Lisp	2021-01-17 04:35:28

#	User	Length	Language	Date
1	Christian Vestergaard	1140	Go	2021-01-04 12:13:01
2	Norbert Voelker	1326	Go	2021-09-25 23:21:48

#	User	Length	Language	Date
1	Matthew Johnson	712	Haskell	2024-05-03 17:29:44
2	hhgrapes	812	Haskell	2024-05-11 13:01:25
3	Steinar Simonnes	1034	Haskell	2024-11-04 18:45:40
4	Miguel Roldán Muñoz	1334	Haskell	2024-06-04 19:51:57
5	Hidden user	1938	Haskell	2022-05-06 11:44:17
6	Marco Polo	2038	Haskell	2022-12-02 21:46:58
7	Lockne	2986	Haskell	2020-09-07 07:03:31

#	User	Length	Language	Date
1	Doug Goodman	592	Java	2017-12-19 18:00:30
2	Ece Pidik	759	Java	2018-10-27 22:33:06
3	Crystal Yang	778	Java	2022-12-03 03:33:28
4	Brennan Cleland	822	Java	2023-06-29 05:30:43
5	Yi OuYang	856	Java	2018-10-26 15:25:49
6	Thomas Denton	890	Java	2019-10-14 01:01:14
7	Frederick LePage	909	Java	2019-03-07 16:41:28
8	Jonathan Harris	915	Java	2016-11-11 23:23:02
9	Zara Horlacher	971	Java	2020-11-02 02:31:45
10	Tuo Yu	976	Java	2019-03-05 16:59:43

#	User	Length	Language	Date
1	Carl Sundvall	1776	JavaScript (Node.js)	2018-10-28 12:30:17

#	User	Length	Language	Date
1	Bjørn Chr. Soltvedt	486	JavaScript (SpiderMonkey)	2016-08-09 14:40:29
2	Christian Pilegaard Cederquist	662	JavaScript (SpiderMonkey)	2023-05-26 22:40:07

#	User	Length	Language	Date
1	Adam Rankin	907	Kotlin	2023-09-15 22:24:47
2	Benjamin Laurence Erickson	985	Kotlin	2023-04-07 18:01:54
3	Troy Warmboe	1074	Kotlin	2023-04-14 23:17:47
4	Hidden user	1720	Kotlin	2020-04-08 23:58:48
5	Andrei Salauyeu	1847	Kotlin	2024-02-22 20:13:06

#	User	Length	Language	Date
1	Ingemar Ragnemalm	841	Pascal	2025-07-03 21:43:18

#	User	Length	Language	Date
1	Saito Ta	194	Perl	2024-04-18 10:50:29

#	User	Length	Language	Date
1	Susanne Ragnemalm	1281	PHP	2024-04-07 11:07:17

#	User	Length	Language	Date
1	Thomas Feld	299	Python 2	2019-10-01 13:53:47
2	Andreas Björklund	365	Python 2	2020-10-24 08:11:48
3	Jesper Öqvist	405	Python 2	2018-11-04 14:00:46
4	Jason Cannon	412	Python 2	2019-12-16 21:45:40
5	Ragur Krishnan	425	Python 2	2018-10-09 04:53:17
6	Oskar Haarklou Veileborg	478	Python 2	2018-10-28 22:31:44
7	Johan Lyts	487	Python 2	2022-11-17 13:31:00
8	Benjamin Labrecque	516	Python 2	2019-03-13 03:23:56
9	James Prescott	516	Python 2	2019-03-13 03:50:36
10	Noah Ó Donnaile	532	Python 2	2018-04-10 20:42:52

#	User	Length	Language	Date
1	Michael Goldwasser	176	Python 3	2025-11-21 05:37:17
2	Benjamin Z White	190	Python 3	2023-05-22 21:05:13
3	Christopher Kopp	212	Python 3	2023-03-03 02:33:10
4	Tommi Järvenpää	215	Python 3	2024-04-03 15:35:00
5	Peter Stauder	232	Python 3	2022-09-26 20:44:52
6	Tai Tze Kin	299	Python 3	2024-05-04 17:58:42
7	Ahmed Chamseddine	304	Python 3	2024-12-18 13:39:09
8	Timothy White	312	Python 3	2021-10-20 23:28:47
9	Noah Hessen Bjerke	327	Python 3	2025-11-15 07:53:30
10	vance	332	Python 3	2022-09-17 06:22:43

#	User	Length	Language	Date
1	Thomas Feld	114	Ruby	2023-08-21 10:19:52

#	User	Length	Language	Date
1	Bas Dirks	1351	Rust	2022-05-09 14:32:56
2	Dalton Cole	1398	Rust	2021-11-07 01:05:26
3	Rudi Svartveit	1569	Rust	2019-04-08 20:51:58
4	None of your buisness	1621	Rust	2023-10-26 05:57:44
5	Adam Gausmann	2087	Rust	2022-08-14 23:32:28
6	Gabriella Gloria	2087	Rust	2025-05-02 13:27:32
7	Diego Alejandro Rodrigues Rodriguez	2418	Rust	2024-02-14 19:12:03
8	Tim Zig	2428	Rust	2024-02-15 20:01:20
9	Pahlevi Fikri Auliya	2777	Rust	2020-11-17 02:24:03
10	Ming Kang	3130	Rust	2025-06-04 09:08:56

Solution running time distribution